Diagnostic Radiologists in California
Data updated monthly · Last refresh October 2026
4,516 Diagnostic Radiology providers practice in California, including 50 (1%) offering telehealth. The largest concentration is in Los Angeles. Profiles include federal Open Payments records of money received from drug and device companies in 2025. Listings are drawn from federal public records and are not endorsements.
4,516providers
50telehealth
Los Angelestop city
Diagnostic Radiology by city in California
Choose a city to see providers there.
Where Diagnostic Radiologists in California practice
From CMS Medicare enrollment records covering 2,842 of the 4,516 providers listed here (63%). Providers who do not bill Medicare are not included in these figures.
6%solo or small practice (under 10 clinicians)
16%mid-size group (10 to 99)
78%large group or health system (100+)
Largest practice groups
| Group (as registered with Medicare) | Diagnostic Radiologists | All clinicians in group | Main city |
| Permanente Medical Group Inc. | 263 | 10,928 | Sacramento |
| Beverly Radiology Medical Group III | 213 | 327 | Riverside |
| Southern California Permanente Medical Group | 175 | 11,250 | Los Angeles |
| Cedars-Sinai Medical Care Foundation | 137 | 1,684 | West Hollywood |
| Sutter Valley Medical Foundation | 135 | 2,473 | Sacramento |
Hospitals where they hold privileges
| Hospital | City | Ownership | CMS star rating | Diagnostic Radiologists affiliated |
| UCSF Medical Center | San Francisco | Nonprofit | 4 of 5 | 170 |
| UC San Diego Health Hillcrest - Hillcrest Med Ctr | San Diego | Nonprofit | 5 of 5 | 125 |
| Uci Health-Orange | Orange | Government | 4 of 5 | 121 |
| Ronald Reagan UCLA Medical Center | Los Angeles | Government | 4 of 5 | 117 |
| Stanford Health Care | Stanford | Nonprofit | 5 of 5 | 108 |
Sources: CMS Doctors and Clinicians (August 2026) and Facility Affiliation files (August 2026); hospital ownership type and overall star rating from CMS Hospital General Information (July 2026). A clinician in several groups is counted once, in the largest group they bill through. Ownership type is what the hospital reports to CMS; it does not show private equity or other investor ownership. How we build this directory.
Diagnostic Radiology providers in California
Listed by city, largest first. Payment figures come from the federal Open Payments program, which requires drug and device companies to report what they pay physicians for consulting, speaking, meals, travel and royalties. A disclosed payment is a financial relationship, not evidence of wrongdoing, and many totals reflect a single meal. Figures cover calendar year 2025.
Dr. Karen Herzog, MDAlameda, CA · No drug or device payments recorded (2025) ·
(510) 522-4146 Dr. Herbert Steinhardt, M.D.Alamo, CA · No drug or device payments recorded (2025) ·
(925) 944-5173 Dr. Chieh-jen Yang, MD.,Alhambra, CA · No drug or device payments recorded (2025) ·
(626) 281-4487 Dr. Daniel Garza, M.D.Alhambra, CA · $433 in drug and device payments (2025) ·
(626) 281-0137 Dr. Henry Sebata, M.D.Alhambra, CA · No drug or device payments recorded (2025) ·
(626) 458-4760 Dr. Richard Chao, M.D.Alhambra, CA · $22 in drug and device payments (2025) ·
(626) 227-2727 Dr. Tinoosh Zand, M.D.Alhambra, CA · No drug or device payments recorded (2025) ·
(310) 694-2262 Dr. George Elias, M.D.Aliso Viejo, CA · $27 in drug and device payments (2025) ·
(949) 633-2862 Dr. Andrew Hwang, M. D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 Dr. Ashkon Senaati, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 678-4000 Dr. Bruce Omiya, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 970-0200 Dr. Crispina Chong-han, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 279-5129 Dr. Dan Lee, MDAnaheim, CA · $188 in drug and device payments (2025) ·
(714) 995-5471 Dr. David Alvarez, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 644-2000 Dr. Douglas Casey, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 970-0200 Dr. Gabriel Cheng, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(562) 683-1317 Dr. Gary Goss, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 970-0200 Dr. Jaime Delgado, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(310) 329-2469 Dr. Jay Kang, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 279-4611 Dr. John Kirby, D.O.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 970-0200 Dr. John Lee, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 999-6080 Dr. Kim Tran, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 279-4000 Dr. Lina Le, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 999-6080 Dr. Mark Sharzer, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(174) 229-4060 Dr. Michael Brand, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 970-0200 Dr. Michael Poh, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 563-2813 Dr. Michael Wang, MDAnaheim, CA · $125 in drug and device payments (2025) ·
(714) 999-6080 Dr. Naser Rahbar, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 229-4060 Dr. Neil Siegel, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 999-6080 Dr. Roy Dorman, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 999-6080 Dr. Russell Keating, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 970-0200 Dr. Tan Nguyen, M.D.Anaheim, CA · No drug or device payments recorded (2025) ·
(714) 970-0200 Dr. William Birnbaum, MDAnaheim, CA · No drug or device payments recorded (2025) ·
(714) 999-6080 Dr. Zain Lalani, MDAnaheim, CA · $1,107 in drug and device payments (2025) ·
(714) 999-3847 Dr. Bailey Lee, M.D.Antioch, CA · No drug or device payments recorded (2025) ·
(925) 296-7156 Dr. Charles TaylorApple Valley, CA · No drug or device payments recorded (2025) ·
(760) 946-5177 Dr. John Thueson, DOApple Valley, CA · No drug or device payments recorded (2025) ·
(760) 699-2900 Dr. Naidi Reddy, M.D.Apple Valley, CA · No drug or device payments recorded (2025) ·
(760) 242-4444 Dr. Percival Williams, RTAptos, CA · No drug or device payments recorded (2025) ·
(831) 420-7105 Dr. Peter Rothschild, M.D.Aptos, CA · No drug or device payments recorded (2025) ·
(510) 604-0700 Dr. Angela Wang, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 446-0080 Dr. Byron Sotomayor, MDArcadia, CA · $163 in drug and device payments (2025) ·
(626) 446-0080 Dr. Daniel Zee, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 445-4850 Dr. Jose Tandoc, MDArcadia, CA · $138 in drug and device payments (2025) ·
(626) 445-4850 Dr. Leon Lis, MDArcadia, CA · No drug or device payments recorded (2025) ·
(626) 445-4850 Dr. Michael Hsu, M.D.Arcadia, CA · $656 in drug and device payments (2025) · Telehealth ·
(626) 898-8004 Dr. Stephen So, M.D.Arcadia, CA · No drug or device payments recorded (2025) ·
(626) 355-8890 Common questions
How many Diagnostic Radiology providers are in California?There are 4,516 Diagnostic Radiology providers with active NPI records practicing in California, according to federal NPPES data refreshed monthly.
Do Diagnostic Radiology providers in California offer telehealth?Yes. 50 of the 4,516 Diagnostic Radiology providers in California (about 1%) report offering telehealth services in CMS data.
Which cities in California have the most Diagnostic Radiology providers?Los Angeles (594), San Diego (377), San Francisco (335) have the highest concentration of Diagnostic Radiology providers in California.
How many Diagnostic Radiology providers in California received drug or device company payments?917 of 4,516 Diagnostic Radiology providers in California (20%) received at least one payment from a drug or device company in 2025, according to the federal Open Payments program.
Where does this data come from?Provider counts and profiles come from the federal NPPES registry and CMS Doctors and Clinicians files. Payment figures come from the CMS Open Payments program for calendar year 2025. The directory refreshes monthly.
Do most Diagnostic Radiologists in California work in independent practices or large health systems?Among 2,842 Diagnostic Radiologists in California enrolled in Medicare, 6% bill through a solo or small practice with fewer than 10 clinicians, 16% through a mid-size group of 10 to 99, and 78% through a large group or health system with 100 or more clinicians, according to CMS enrollment records.
Which hospitals do Diagnostic Radiologists in California work at?According to CMS facility affiliation records, the California hospitals where the most Diagnostic Radiologists hold privileges are UCSF Medical Center in San Francisco; UC San Diego Health Hillcrest - Hillcrest Med Ctr in San Diego; Uci Health-Orange in Orange.
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